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mathematics

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Timothy had a total of 238 blue and red marbles. He gave 3/7 of the blue marbles and 5/8 of the red marbles away. Altogether, Timothy gave away 124 marbles.How many red marbles did Timothy give away? (Skill: Equations)

  • mathematics - ,

    B + R = 238
    3B/7 + 5R/8 = 124
    Multiply both sides of the last equation by 8/5.
    24B/35 + R = 198.4
    Subtract the above equation from the first one.
    11B/35 = 39.6
    Multiply both sides by 35/11
    B = 126
    R = 112 is the number of red marbles.

  • mathematics - ,

    654
    87
    567

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